diff --git a/app/scripts/background.js b/app/scripts/background.js
index f3c0b52b3..8aa886594 100644
--- a/app/scripts/background.js
+++ b/app/scripts/background.js
@@ -1,41 +1,57 @@
 const urlUtil = require('url')
-const extend = require('xtend')
 const Dnode = require('dnode')
 const eos = require('end-of-stream')
+const Migrator = require('pojo-migrator')
+const migrations = require('./lib/migrations')
+const LocalStorageStore = require('./lib/observable/local-storage')
 const PortStream = require('./lib/port-stream.js')
 const notification = require('./lib/notifications.js')
 const messageManager = require('./lib/message-manager')
 const setupMultiplex = require('./lib/stream-utils.js').setupMultiplex
 const MetamaskController = require('./metamask-controller')
 const extension = require('./lib/extension')
+const firstTimeState = require('./first-time-state')
 
 const STORAGE_KEY = 'metamask-config'
 const METAMASK_DEBUG = 'GULP_METAMASK_DEBUG'
-var popupIsOpen = false
+let popupIsOpen = false
 
 
+//
+// State and Persistence
+//
+
+// state persistence
+
+let dataStore = new LocalStorageStore({ storageKey: STORAGE_KEY })
+// initial state for first time users
+if (!dataStore.get()) {
+  dataStore.put({ meta: { version: 0 }, data: firstTimeState })
+}
+
+// migrations
+
+let migrator = new Migrator({
+  migrations,
+  // Data persistence methods
+  loadData: () => dataStore.get(),
+  setData: (newState) => dataStore.put(newState),
+})
+
+//
+// MetaMask Controller
+//
+
 const controller = new MetamaskController({
   // User confirmation callbacks:
   showUnconfirmedMessage: triggerUi,
   unlockAccountMessage: triggerUi,
   showUnapprovedTx: triggerUi,
   // initial state
-  initState: loadData(),
+  initState: migrator.getData(),
 })
 // setup state persistence
-controller.store.subscribe(setData)
-
-const txManager = controller.txManager
-function triggerUi () {
-  if (!popupIsOpen) notification.show()
-}
-// On first install, open a window to MetaMask website to how-it-works.
-
-extension.runtime.onInstalled.addListener(function (details) {
-  if ((details.reason === 'install') && (!METAMASK_DEBUG)) {
-    extension.tabs.create({url: 'https://metamask.io/#how-it-works'})
-  }
-})
+controller.store.subscribe((newState) => migrator.saveData(newState))
 
 //
 // connect to other contexts
@@ -94,11 +110,23 @@ function setupControllerConnection (stream) {
 }
 
 //
-// plugin badge text
+// User Interface setup
 //
 
-txManager.on('updateBadge', updateBadge)
+// popup trigger
+function triggerUi () {
+  if (!popupIsOpen) notification.show()
+}
 
+// On first install, open a window to MetaMask website to how-it-works.
+extension.runtime.onInstalled.addListener(function (details) {
+  if ((details.reason === 'install') && (!METAMASK_DEBUG)) {
+    extension.tabs.create({url: 'https://metamask.io/#how-it-works'})
+  }
+})
+
+// plugin badge text
+controller.txManager.on('updateBadge', updateBadge)
 function updateBadge () {
   var label = ''
   var unapprovedTxCount = controller.txManager.unapprovedTxCount
@@ -111,33 +139,3 @@ function updateBadge () {
   extension.browserAction.setBadgeText({ text: label })
   extension.browserAction.setBadgeBackgroundColor({ color: '#506F8B' })
 }
-
-// data :: setters/getters
-
-function loadData () {
-  let defaultData = {
-    meta: {
-      version: 0,
-    },
-    data: {
-      config: {
-        provider: {
-          type: 'testnet',
-        },
-      },
-    },
-  }
-
-  var persisted
-  try {
-    persisted = JSON.parse(window.localStorage[STORAGE_KEY])
-  } catch (err) {
-    persisted = null
-  }
-
-  return extend(defaultData, persisted)
-}
-
-function setData (data) {
-  window.localStorage[STORAGE_KEY] = JSON.stringify(data)
-}
diff --git a/app/scripts/first-time-state.js b/app/scripts/first-time-state.js
new file mode 100644
index 000000000..3196981ba
--- /dev/null
+++ b/app/scripts/first-time-state.js
@@ -0,0 +1,11 @@
+//
+// The default state of MetaMask
+//
+
+module.exports = {
+  config: {
+    provider: {
+      type: 'testnet',
+    },
+  },
+}
\ No newline at end of file
diff --git a/app/scripts/lib/config-manager.js b/app/scripts/lib/config-manager.js
index 01e6ccc3c..6d7305377 100644
--- a/app/scripts/lib/config-manager.js
+++ b/app/scripts/lib/config-manager.js
@@ -1,6 +1,4 @@
-const Migrator = require('pojo-migrator')
 const MetamaskConfig = require('../config.js')
-const migrations = require('./migrations')
 const ethUtil = require('ethereumjs-util')
 const normalize = require('./sig-util').normalize
 
@@ -20,38 +18,17 @@ function ConfigManager (opts) {
   // ConfigManager is observable and will emit updates
   this._subs = []
   this.store = opts.store
-
-  /* The migrator exported on the config-manager
-   * has two methods the user should be concerned with:
-   *
-   * getData(), which returns the app-consumable data object
-   * saveData(), which persists the app-consumable data object.
-   */
-  this.migrator = new Migrator({
-
-    // Migrations must start at version 1 or later.
-    // They are objects with a `version` number
-    // and a `migrate` function.
-    //
-    // The `migrate` function receives the previous
-    // config data format, and returns the new one.
-    migrations: migrations,
-
-    // Data persistence methods
-    loadData: () => this.store.get(),
-    setData: (value) => this.store.put(value),
-  })
 }
 
 ConfigManager.prototype.setConfig = function (config) {
-  var data = this.migrator.getData()
+  var data = this.store.get()
   data.config = config
   this.setData(data)
   this._emitUpdates(config)
 }
 
 ConfigManager.prototype.getConfig = function () {
-  var data = this.migrator.getData()
+  var data = this.store.get()
   if ('config' in data) {
     return data.config
   } else {
@@ -94,15 +71,15 @@ ConfigManager.prototype.getProvider = function () {
 }
 
 ConfigManager.prototype.setData = function (data) {
-  this.migrator.saveData(data)
+  this.store.put(data)
 }
 
 ConfigManager.prototype.getData = function () {
-  return this.migrator.getData()
+  return this.store.get()
 }
 
 ConfigManager.prototype.setWallet = function (wallet) {
-  var data = this.migrator.getData()
+  var data = this.store.get()
   data.wallet = wallet
   this.setData(data)
 }
@@ -119,11 +96,11 @@ ConfigManager.prototype.getVault = function () {
 }
 
 ConfigManager.prototype.getKeychains = function () {
-  return this.migrator.getData().keychains || []
+  return this.store.get().keychains || []
 }
 
 ConfigManager.prototype.setKeychains = function (keychains) {
-  var data = this.migrator.getData()
+  var data = this.store.get()
   data.keychains = keychains
   this.setData(data)
 }
@@ -140,19 +117,19 @@ ConfigManager.prototype.setSelectedAccount = function (address) {
 }
 
 ConfigManager.prototype.getWallet = function () {
-  return this.migrator.getData().wallet
+  return this.store.get().wallet
 }
 
 // Takes a boolean
 ConfigManager.prototype.setShowSeedWords = function (should) {
-  var data = this.migrator.getData()
+  var data = this.store.get()
   data.showSeedWords = should
   this.setData(data)
 }
 
 
 ConfigManager.prototype.getShouldShowSeedWords = function () {
-  var data = this.migrator.getData()
+  var data = this.store.get()
   return data.showSeedWords
 }
 
@@ -187,7 +164,7 @@ ConfigManager.prototype.getCurrentRpcAddress = function () {
 }
 
 ConfigManager.prototype.setData = function (data) {
-  this.migrator.saveData(data)
+  this.store.put(data)
 }
 
 //
@@ -195,7 +172,7 @@ ConfigManager.prototype.setData = function (data) {
 //
 
 ConfigManager.prototype.getTxList = function () {
-  var data = this.migrator.getData()
+  var data = this.store.get()
   if (data.transactions !== undefined) {
     return data.transactions
   } else {
@@ -204,7 +181,7 @@ ConfigManager.prototype.getTxList = function () {
 }
 
 ConfigManager.prototype.setTxList = function (txList) {
-  var data = this.migrator.getData()
+  var data = this.store.get()
   data.transactions = txList
   this.setData(data)
 }
diff --git a/app/scripts/lib/migrations.js b/app/scripts/lib/migrations.js
index f026cbe53..12f60def1 100644
--- a/app/scripts/lib/migrations.js
+++ b/app/scripts/lib/migrations.js
@@ -1,3 +1,16 @@
+/* The migrator has two methods the user should be concerned with:
+ * 
+ * getData(), which returns the app-consumable data object
+ * saveData(), which persists the app-consumable data object.
+ */
+
+// Migrations must start at version 1 or later.
+// They are objects with a `version` number
+// and a `migrate` function.
+//
+// The `migrate` function receives the previous
+// config data format, and returns the new one.
+
 module.exports = [
   require('../migrations/002'),
   require('../migrations/003'),
diff --git a/app/scripts/lib/observable/host.js b/app/scripts/lib/observable/host.js
index 69f674be8..d1b110503 100644
--- a/app/scripts/lib/observable/host.js
+++ b/app/scripts/lib/observable/host.js
@@ -12,14 +12,14 @@ class HostStore extends ObservableStore {
 
   constructor (initState, opts) {
     super(initState)
-    this.opts = opts || {}
+    this._opts = opts || {}
   }
 
   createStream () {
     const self = this
     // setup remotely exposed api
     let remoteApi = {}
-    if (!self.opts.readOnly) {
+    if (!self._opts.readOnly) {
       remoteApi.put = (newState) => self.put(newState)
     }
     // listen for connection to remote
diff --git a/app/scripts/lib/observable/index.js b/app/scripts/lib/observable/index.js
index d193e5554..1ff112e95 100644
--- a/app/scripts/lib/observable/index.js
+++ b/app/scripts/lib/observable/index.js
@@ -7,22 +7,30 @@ class ObservableStore extends EventEmitter {
     this._state = initialState
   }
 
+  // wrapper around internal get
   get () {
     return this._state
   }
-
+  
+  // wrapper around internal put
   put (newState) {
     this._put(newState)
   }
 
+  // subscribe to changes
   subscribe (handler) {
     this.on('update', handler)
   }
 
+  // unsubscribe to changes
   unsubscribe (handler) {
     this.removeListener('update', handler)
   }
 
+  //
+  // private
+  //
+
   _put (newState) {
     this._state = newState
     this.emit('update', newState)
diff --git a/app/scripts/lib/observable/local-storage.js b/app/scripts/lib/observable/local-storage.js
new file mode 100644
index 000000000..6ed3860f6
--- /dev/null
+++ b/app/scripts/lib/observable/local-storage.js
@@ -0,0 +1,37 @@
+const ObservableStore = require('./index')
+
+//
+// LocalStorageStore
+//
+// uses localStorage instead of a cache
+//
+
+class LocalStorageStore extends ObservableStore {
+
+  constructor (opts) {
+    super()
+    delete this._state
+
+    this._opts = opts || {}
+    if (!this._opts.storageKey) {
+      throw new Error('LocalStorageStore - no "storageKey" specified')
+    }
+    this._storageKey = this._opts.storageKey
+  }
+
+  get() {
+    try {
+      return JSON.parse(global.localStorage[this._storageKey])
+    } catch (err) {
+      return undefined
+    }
+  }
+
+  _put(newState) {
+    global.localStorage[this._storageKey] = JSON.stringify(newState)
+    this.emit('update', newState)
+  }
+
+}
+
+module.exports = LocalStorageStore
diff --git a/app/scripts/lib/observable/remote.js b/app/scripts/lib/observable/remote.js
index b5a3254a2..603f6f0b8 100644
--- a/app/scripts/lib/observable/remote.js
+++ b/app/scripts/lib/observable/remote.js
@@ -12,7 +12,7 @@ class RemoteStore extends ObservableStore {
 
   constructor (initState, opts) {
     super(initState)
-    this.opts = opts || {}
+    this._opts = opts || {}
     this._remote = null
   }
 
diff --git a/app/scripts/lib/observable/util/sync.js b/app/scripts/lib/observable/util/sync.js
new file mode 100644
index 000000000..c61feb02e
--- /dev/null
+++ b/app/scripts/lib/observable/util/sync.js
@@ -0,0 +1,24 @@
+
+//
+// synchronizeStore(inStore, outStore, stateTransform)
+//
+// keeps outStore synchronized with inStore, via an optional stateTransform
+//
+
+module.exports = synchronizeStore
+
+
+function synchronizeStore(inStore, outStore, stateTransform) {
+  stateTransform = stateTransform || transformNoop
+  const initState = stateTransform(inStore.get())
+  outStore.put(initState)
+  inStore.subscribe((inState) => {
+    const outState = stateTransform(inState)
+    outStore.put(outState)
+  })
+  return outStore
+}
+
+function transformNoop(state) {
+  return state
+}
\ No newline at end of file
diff --git a/app/scripts/lib/observable/util/transform.js b/app/scripts/lib/observable/util/transform.js
deleted file mode 100644
index 87946f402..000000000
--- a/app/scripts/lib/observable/util/transform.js
+++ /dev/null
@@ -1,13 +0,0 @@
-
-module.exports = transformStore
-
-
-function transformStore(inStore, outStore, stateTransform) {
-  const initState = stateTransform(inStore.get())
-  outStore.put(initState)
-  inStore.subscribe((inState) => {
-    const outState = stateTransform(inState)
-    outStore.put(outState)
-  })
-  return outStore
-}
\ No newline at end of file
diff --git a/app/scripts/metamask-controller.js b/app/scripts/metamask-controller.js
index 8e0eaf54c..e15844a56 100644
--- a/app/scripts/metamask-controller.js
+++ b/app/scripts/metamask-controller.js
@@ -14,7 +14,7 @@ const nodeify = require('./lib/nodeify')
 const IdStoreMigrator = require('./lib/idStore-migrator')
 const ObservableStore = require('./lib/observable/')
 const HostStore = require('./lib/observable/host')
-const transformStore = require('./lib/observable/util/transform')
+const synchronizeStore = require('./lib/observable/util/sync')
 const version = require('../manifest.json').version
 
 module.exports = class MetamaskController extends EventEmitter {
@@ -244,12 +244,12 @@ module.exports = class MetamaskController extends EventEmitter {
     var publicConfigStore = new HostStore(initPublicState, { readOnly: true })
 
     // sync publicConfigStore with transform
-    transformStore(this.store, publicConfigStore, selectPublicState)
+    synchronizeStore(this.store, publicConfigStore, selectPublicState)
 
     function selectPublicState(state) {
       let result = { selectedAccount: undefined }
       try {
-        result.selectedAccount = state.data.config.selectedAccount
+        result.selectedAccount = state.config.selectedAccount
       } catch (err) {
         console.warn('Error in "selectPublicState": ' + err.message)
       }
diff --git a/mock-dev.js b/mock-dev.js
index dfd0b4961..a404c64b0 100644
--- a/mock-dev.js
+++ b/mock-dev.js
@@ -12,6 +12,9 @@
  * To use, run `npm run mock`.
  */
 
+// pollyfill localStorage for non-browser environments
+if (!global.localStorage) global.localStorage
+
 const extend = require('xtend')
 const render = require('react-dom').render
 const h = require('react-hyperscript')
@@ -21,93 +24,62 @@ const actions = require('./ui/app/actions')
 const states = require('./development/states')
 const Selector = require('./development/selector')
 const MetamaskController = require('./app/scripts/metamask-controller')
+const firstTimeState = require('./app/scripts/first-time-state')
+const LocalStorageStore = require('./app/scripts/lib/observable/local-storage')
+const synchronizeStore = require('./app/scripts/lib/observable/util/sync')
 const extension = require('./development/mockExtension')
+const noop = function () {}
 
+const STORAGE_KEY = 'metamask-config'
+
+//
 // Query String
+//
+
 const qs = require('qs')
 let queryString = qs.parse(window.location.href.split('#')[1])
 let selectedView = queryString.view || 'first time'
 const firstState = states[selectedView]
 updateQueryParams(selectedView)
 
-// CSS
-const MetaMaskUiCss = require('./ui/css')
-const injectCss = require('inject-css')
-
-
 function updateQueryParams(newView) {
   queryString.view = newView
   const params = qs.stringify(queryString)
   window.location.href = window.location.href.split('#')[0] + `#${params}`
 }
 
-const noop = function () {}
+//
+// CSS
+//
+
+const MetaMaskUiCss = require('./ui/css')
+const injectCss = require('inject-css')
+
+//
+// MetaMask Controller
+//
+
+let dataStore = new LocalStorageStore({ storageKey: STORAGE_KEY })
+// initial state for first time users
+if (!dataStore.get()) {
+  dataStore.put(firstTimeState)
+}
+
 const controller = new MetamaskController({
   // User confirmation callbacks:
   showUnconfirmedMessage: noop,
   unlockAccountMessage: noop,
   showUnapprovedTx: noop,
   // initial state
-  initState: loadData(),
+  initState: dataStore.get(),
 })
 
 // setup state persistence
-controller.store.subscribe(setData)
+synchronizeStore(controller.store, dataStore)
 
-// Stub out localStorage for non-browser environments
-if (!window.localStorage) {
-  window.localStorage = {}
-}
-const STORAGE_KEY = 'metamask-config'
-function loadData () {
-  var oldData = getOldStyleData()
-  var newData
-  try {
-    newData = JSON.parse(window.localStorage[STORAGE_KEY])
-  } catch (e) {}
-
-  var data = extend({
-    meta: {
-      version: 0,
-    },
-    data: {
-      config: {
-        provider: {
-          type: 'testnet',
-        },
-      },
-    },
-  }, oldData || null, newData || null)
-  return data
-}
-
-function setData (data) {
-  window.localStorage[STORAGE_KEY] = JSON.stringify(data)
-}
-
-function getOldStyleData () {
-  var config, wallet, seedWords
-
-  var result = {
-    meta: { version: 0 },
-    data: {},
-  }
-
-  try {
-    config = JSON.parse(window.localStorage['config'])
-    result.data.config = config
-  } catch (e) {}
-  try {
-    wallet = JSON.parse(window.localStorage['lightwallet'])
-    result.data.wallet = wallet
-  } catch (e) {}
-  try {
-    seedWords = window.localStorage['seedWords']
-    result.data.seedWords = seedWords
-  } catch (e) {}
-
-  return result
-}
+//
+// User Interface
+//
 
 actions._setBackgroundConnection(controller.getApi())
 actions.update = function(stateName) {
diff --git a/test/integration/lib/idStore-migrator-test.js b/test/integration/lib/idStore-migrator-test.js
index 1ceaac442..d95cfb401 100644
--- a/test/integration/lib/idStore-migrator-test.js
+++ b/test/integration/lib/idStore-migrator-test.js
@@ -4,8 +4,8 @@ const IdStoreMigrator = require('../../../app/scripts/lib/idStore-migrator')
 const SimpleKeyring = require('../../../app/scripts/keyrings/simple')
 const normalize = require('../../../app/scripts/lib/sig-util').normalize
 
-const oldStyleVault = require('../mocks/oldVault.json')
-const badStyleVault = require('../mocks/badVault.json')
+const oldStyleVault = require('../mocks/oldVault.json').data
+const badStyleVault = require('../mocks/badVault.json').data
 
 const PASSWORD = '12345678'
 const FIRST_ADDRESS = '0x4dd5d356c5A016A220bCD69e82e5AF680a430d00'.toLowerCase()
@@ -14,15 +14,10 @@ const SEED = 'fringe damage bounce extend tunnel afraid alert sound all soldier
 
 QUnit.module('Old Style Vaults', {
   beforeEach: function () {
-    let store = new ObservableStore(oldStyleVault)
-
-    this.configManager = new ConfigManager({
-      store: store,
-    })
-
-    this.migrator = new IdStoreMigrator({
-      configManager: this.configManager,
-    })
+    let managers = managersFromInitState(oldStyleVault)
+    
+    this.configManager = managers.configManager
+    this.migrator = managers.migrator
   }
 })
 
@@ -35,6 +30,7 @@ QUnit.test('migrator:migratedVaultForPassword', function (assert) {
 
   this.migrator.migratedVaultForPassword(PASSWORD)
   .then((result) => {
+    assert.ok(result, 'migratedVaultForPassword returned result')
     const { serialized, lostAccounts } = result
     assert.equal(serialized.data.mnemonic, SEED, 'seed phrase recovered')
     assert.equal(lostAccounts.length, 0, 'no lost accounts')
@@ -44,15 +40,10 @@ QUnit.test('migrator:migratedVaultForPassword', function (assert) {
 
 QUnit.module('Old Style Vaults with bad HD seed', {
   beforeEach: function () {
-    let store = new ObservableStore(badStyleVault)
-
-    this.configManager = new ConfigManager({
-      store: store,
-    })
-
-    this.migrator = new IdStoreMigrator({
-      configManager: this.configManager,
-    })
+    let managers = managersFromInitState(badStyleVault)
+    
+    this.configManager = managers.configManager
+    this.migrator = managers.migrator
   }
 })
 
@@ -61,6 +52,7 @@ QUnit.test('migrator:migratedVaultForPassword', function (assert) {
 
   this.migrator.migratedVaultForPassword(PASSWORD)
   .then((result) => {
+    assert.ok(result, 'migratedVaultForPassword returned result')
     const { serialized, lostAccounts } = result
 
     assert.equal(lostAccounts.length, 1, 'one lost account')
@@ -86,3 +78,15 @@ QUnit.test('migrator:migratedVaultForPassword', function (assert) {
   })
 })
 
+function managersFromInitState(initState){
+
+  let configManager = new ConfigManager({
+    store: new ObservableStore(initState),
+  })
+
+  let migrator = new IdStoreMigrator({
+    configManager: configManager,
+  })
+
+  return { configManager, migrator }
+}
\ No newline at end of file
diff --git a/test/lib/mock-config-manager.js b/test/lib/mock-config-manager.js
index 0e84aa001..c62d91da9 100644
--- a/test/lib/mock-config-manager.js
+++ b/test/lib/mock-config-manager.js
@@ -1,61 +1,11 @@
 const ConfigManager = require('../../app/scripts/lib/config-manager')
-const ObservableStore = require('../../app/scripts/lib/observable/')
+const LocalStorageStore = require('../../app/scripts/lib/observable/local-storage')
+const firstTimeState = require('../../app/scripts/first-time-state')
 const STORAGE_KEY = 'metamask-config'
-const extend = require('xtend')
 
 module.exports = function() {
-  let store = new ObservableStore(loadData())
-  store.subscribe(setData)
-  return new ConfigManager({ store })
-}
-
-function loadData () {
-  var oldData = getOldStyleData()
-  var newData
-
-  try {
-    newData = JSON.parse(window.localStorage[STORAGE_KEY])
-  } catch (e) {}
-
-  var data = extend({
-    meta: {
-      version: 0,
-    },
-    data: {
-      config: {
-        provider: {
-          type: 'testnet',
-        },
-      },
-    },
-  }, oldData || null, newData || null)
-  return data
-}
-
-function getOldStyleData () {
-  var config, wallet, seedWords
-
-  var result = {
-    meta: { version: 0 },
-    data: {},
-  }
-
-  try {
-    config = JSON.parse(window.localStorage['config'])
-    result.data.config = config
-  } catch (e) {}
-  try {
-    wallet = JSON.parse(window.localStorage['lightwallet'])
-    result.data.wallet = wallet
-  } catch (e) {}
-  try {
-    seedWords = window.localStorage['seedWords']
-    result.data.seedWords = seedWords
-  } catch (e) {}
-
-  return result
-}
-
-function setData (data) {
-  window.localStorage[STORAGE_KEY] = JSON.stringify(data)
-}
+  let dataStore = new LocalStorageStore({ storageKey: STORAGE_KEY })
+  // initial state for first time users
+  if (!dataStore.get()) dataStore.put(firstTimeState)
+  return new ConfigManager({ store: dataStore })
+}
\ No newline at end of file
diff --git a/test/unit/config-manager-test.js b/test/unit/config-manager-test.js
index 77d431d5f..83b242a8b 100644
--- a/test/unit/config-manager-test.js
+++ b/test/unit/config-manager-test.js
@@ -1,5 +1,8 @@
 // polyfill fetch
 global.fetch = global.fetch || require('isomorphic-fetch')
+// pollyfill localStorage support into JSDom
+global.localStorage = global.localStorage || polyfillLocalStorage()
+
 const assert = require('assert')
 const extend = require('xtend')
 const rp = require('request-promise')
@@ -11,7 +14,7 @@ describe('config-manager', function() {
   var configManager
 
   beforeEach(function() {
-    window.localStorage = {} // Hacking localStorage support into JSDom
+    global.localStorage.clear()
     configManager = configManagerGen()
   })
 
@@ -132,7 +135,6 @@ describe('config-manager', function() {
   })
 
   describe('#setConfig', function() {
-    window.localStorage = {} // Hacking localStorage support into JSDom
 
     it('should set the config key', function () {
       var testConfig = {
@@ -238,3 +240,7 @@ describe('config-manager', function() {
     })
   })
 })
+
+function polyfillLocalStorage(){
+  return Object.create({ clear: function(){ global.localStorage = polyfillLocalStorage() } })
+}